| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/core/SkStrike.h" |
| |
| #include "include/core/SkGraphics.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkTypeface.h" |
| #include "include/private/SkMutex.h" |
| #include "include/private/SkOnce.h" |
| #include "include/private/SkTemplates.h" |
| #include "src/core/SkMakeUnique.h" |
| #include <cctype> |
| |
| SkStrike::SkStrike( |
| const SkDescriptor& desc, |
| std::unique_ptr<SkScalerContext> scaler, |
| const SkFontMetrics& fontMetrics) |
| : fDesc{desc} |
| , fScalerContext{std::move(scaler)} |
| , fFontMetrics{fontMetrics} |
| , fIsSubpixel{fScalerContext->isSubpixel()} |
| , fAxisAlignment{fScalerContext->computeAxisAlignmentForHText()} |
| { |
| SkASSERT(fScalerContext != nullptr); |
| fMemoryUsed = sizeof(*this); |
| } |
| |
| #ifdef SK_DEBUG |
| #define VALIDATE() AutoValidate av(this) |
| #else |
| #define VALIDATE() |
| #endif |
| |
| // -- glyph creation ------------------------------------------------------------------------------- |
| SkGlyph* SkStrike::makeGlyph(SkPackedGlyphID packedGlyphID) { |
| fMemoryUsed += sizeof(SkGlyph); |
| SkGlyph* glyph = fAlloc.make<SkGlyph>(packedGlyphID); |
| fGlyphMap.set(glyph); |
| return glyph; |
| } |
| |
| SkGlyph* SkStrike::uninitializedGlyph(SkPackedGlyphID id) { |
| SkGlyph* glyph = fGlyphMap.findOrNull(id); |
| if (glyph == nullptr) { |
| glyph = this->makeGlyph(id); |
| } |
| return glyph; |
| } |
| |
| SkGlyph* SkStrike::glyph(SkPackedGlyphID packedGlyphID) { |
| SkGlyph* glyph = fGlyphMap.findOrNull(packedGlyphID); |
| if (glyph == nullptr) { |
| glyph = this->makeGlyph(packedGlyphID); |
| fScalerContext->getMetrics(glyph); |
| } |
| return glyph; |
| } |
| |
| SkGlyph* SkStrike::glyph(SkGlyphID glyphID) { |
| return this->glyph(SkPackedGlyphID{glyphID}); |
| } |
| |
| SkGlyph* SkStrike::glyphFromPrototype(const SkGlyphPrototype& p) { |
| SkGlyph* glyph = fGlyphMap.findOrNull(p.id); |
| if (glyph == nullptr) { |
| fMemoryUsed += sizeof(SkGlyph); |
| glyph = fAlloc.make<SkGlyph>(p); |
| fGlyphMap.set(glyph); |
| } |
| return glyph; |
| } |
| |
| SkGlyph* SkStrike::glyphOrNull(SkPackedGlyphID id) const { |
| return fGlyphMap.findOrNull(id); |
| } |
| |
| SkGlyph* SkStrike::getRawGlyphByID(SkPackedGlyphID id) { |
| return this->uninitializedGlyph(id); |
| } |
| |
| const SkGlyph& SkStrike::getGlyphIDMetrics(SkGlyphID glyphID) { |
| VALIDATE(); |
| return *this->glyph(glyphID); |
| } |
| |
| const SkGlyph& SkStrike::getGlyphIDMetrics(SkPackedGlyphID id) { |
| VALIDATE(); |
| return *this->glyph(id); |
| } |
| |
| const SkGlyph& SkStrike::getGlyphIDMetrics(SkGlyphID glyphID, SkFixed x, SkFixed y) { |
| SkPackedGlyphID packedGlyphID(glyphID, x, y); |
| return *this->glyph(packedGlyphID); |
| } |
| |
| const SkPath* SkStrike::preparePath(SkGlyph* glyph) { |
| if (glyph->setPath(&fAlloc, fScalerContext.get())) { |
| fMemoryUsed += glyph->path()->approximateBytesUsed(); |
| } |
| return glyph->path(); |
| } |
| |
| const SkPath* SkStrike::preparePath(SkGlyph* glyph, const SkPath* path) { |
| if (glyph->setPath(&fAlloc, path)) { |
| fMemoryUsed += glyph->path()->approximateBytesUsed(); |
| } |
| return glyph->path(); |
| } |
| |
| const SkDescriptor& SkStrike::getDescriptor() const { |
| return *fDesc.getDesc(); |
| } |
| |
| unsigned SkStrike::getGlyphCount() const { |
| return fScalerContext->getGlyphCount(); |
| } |
| |
| int SkStrike::countCachedGlyphs() const { |
| return fGlyphMap.count(); |
| } |
| |
| bool SkStrike::isGlyphCached(SkGlyphID glyphID, SkFixed x, SkFixed y) const { |
| SkPackedGlyphID packedGlyphID{glyphID, x, y}; |
| return fGlyphMap.find(packedGlyphID) != nullptr; |
| } |
| |
| void SkStrike::getAdvances(SkSpan<const SkGlyphID> glyphIDs, SkPoint advances[]) { |
| for (auto glyphID : glyphIDs) { |
| auto glyph = this->glyph(glyphID); |
| *advances++ = SkPoint::Make(glyph->fAdvanceX, glyph->fAdvanceY); |
| } |
| } |
| |
| const void* SkStrike::findImage(const SkGlyph& glyph) { |
| if (glyph.fWidth > 0 && glyph.fWidth < kMaxGlyphWidth) { |
| if (nullptr == glyph.fImage) { |
| SkDEBUGCODE(SkMask::Format oldFormat = (SkMask::Format)glyph.fMaskFormat); |
| size_t size = const_cast<SkGlyph&>(glyph).allocImage(&fAlloc); |
| // check that alloc() actually succeeded |
| if (glyph.fImage) { |
| fScalerContext->getImage(glyph); |
| // TODO: the scaler may have changed the maskformat during |
| // getImage (e.g. from AA or LCD to BW) which means we may have |
| // overallocated the buffer. Check if the new computedImageSize |
| // is smaller, and if so, strink the alloc size in fImageAlloc. |
| fMemoryUsed += size; |
| } |
| SkASSERT(oldFormat == glyph.fMaskFormat); |
| } |
| } |
| return glyph.fImage; |
| } |
| |
| void SkStrike::initializeImage(const volatile void* data, size_t size, SkGlyph* glyph) { |
| SkASSERT(!glyph->fImage); |
| |
| if (glyph->fWidth > 0 && glyph->fWidth < kMaxGlyphWidth) { |
| size_t allocSize = glyph->allocImage(&fAlloc); |
| // check that alloc() actually succeeded |
| if (glyph->fImage) { |
| SkASSERT(size == allocSize); |
| memcpy(glyph->fImage, const_cast<const void*>(data), allocSize); |
| fMemoryUsed += size; |
| } |
| } |
| } |
| |
| |
| bool SkStrike::belongsToCache(const SkGlyph* glyph) const { |
| return glyph && fGlyphMap.findOrNull(glyph->getPackedID()) == glyph; |
| } |
| |
| const SkGlyph* SkStrike::getCachedGlyphAnySubPix(SkGlyphID glyphID, |
| SkPackedGlyphID vetoID) const { |
| for (SkFixed subY = 0; subY < SK_Fixed1; subY += SK_FixedQuarter) { |
| for (SkFixed subX = 0; subX < SK_Fixed1; subX += SK_FixedQuarter) { |
| SkPackedGlyphID packedGlyphID{glyphID, subX, subY}; |
| if (packedGlyphID == vetoID) continue; |
| if (SkGlyph* glyphPtr = fGlyphMap.findOrNull(packedGlyphID)) { |
| return glyphPtr; |
| } |
| } |
| } |
| |
| return nullptr; |
| } |
| |
| void SkStrike::initializeGlyphFromFallback(SkGlyph* glyph, const SkGlyph& fallback) { |
| fMemoryUsed += glyph->copyImageData(fallback, &fAlloc); |
| } |
| |
| SkVector SkStrike::rounding() const { |
| return SkStrikeCommon::PixelRounding(fIsSubpixel, fAxisAlignment); |
| } |
| |
| const SkGlyph& SkStrike::getGlyphMetrics(SkGlyphID glyphID, SkPoint position) { |
| if (!fIsSubpixel) { |
| return this->getGlyphIDMetrics(glyphID); |
| } else { |
| SkIPoint lookupPosition = SkStrikeCommon::SubpixelLookup(fAxisAlignment, position); |
| |
| return this->getGlyphIDMetrics(glyphID, lookupPosition.x(), lookupPosition.y()); |
| } |
| } |
| |
| // N.B. This glyphMetrics call culls all the glyphs which will not display based on a non-finite |
| // position or that there are no mask pixels. |
| SkSpan<const SkGlyphPos> SkStrike::prepareForDrawing(const SkGlyphID glyphIDs[], |
| const SkPoint positions[], |
| size_t n, |
| int maxDimension, |
| PreparationDetail detail, |
| SkGlyphPos result[]) { |
| size_t drawableGlyphCount = 0; |
| for (size_t i = 0; i < n; i++) { |
| SkPoint position = positions[i]; |
| if (SkScalarsAreFinite(position.x(), position.y())) { |
| // This assumes that the strike has no sub-pixel positioning for glyphs that are |
| // transformed from source space to device space. |
| const SkGlyph& glyph = this->getGlyphMetrics(glyphIDs[i], position); |
| if (!glyph.isEmpty()) { |
| result[drawableGlyphCount++] = {i, &glyph, position}; |
| if (glyph.maxDimension() <= maxDimension) { |
| // Glyph fits in the atlas, good to go. |
| if (detail == SkStrikeInterface::kImageIfNeeded) { |
| this->findImage(glyph); |
| } |
| } else if (glyph.fMaskFormat != SkMask::kARGB32_Format) { |
| // The out of atlas glyph is not color so we can draw it using paths. |
| this->preparePath(const_cast<SkGlyph*>(&glyph)); |
| } else { |
| // This will be handled by the fallback strike. |
| SkASSERT(glyph.maxDimension() > maxDimension |
| && glyph.fMaskFormat == SkMask::kARGB32_Format); |
| } |
| } |
| } |
| } |
| |
| return SkSpan<const SkGlyphPos>{result, drawableGlyphCount}; |
| } |
| |
| void SkStrike::findIntercepts(const SkScalar bounds[2], SkScalar scale, SkScalar xPos, |
| SkGlyph* glyph, SkScalar* array, int* count) { |
| glyph->ensureIntercepts(bounds, scale, xPos, array, count, &fAlloc); |
| } |
| |
| void SkStrike::dump() const { |
| const SkTypeface* face = fScalerContext->getTypeface(); |
| const SkScalerContextRec& rec = fScalerContext->getRec(); |
| SkMatrix matrix; |
| rec.getSingleMatrix(&matrix); |
| matrix.preScale(SkScalarInvert(rec.fTextSize), SkScalarInvert(rec.fTextSize)); |
| SkString name; |
| face->getFamilyName(&name); |
| |
| SkString msg; |
| SkFontStyle style = face->fontStyle(); |
| msg.printf("cache typeface:%x %25s:(%d,%d,%d)\n %s glyphs:%3d", |
| face->uniqueID(), name.c_str(), style.weight(), style.width(), style.slant(), |
| rec.dump().c_str(), fGlyphMap.count()); |
| SkDebugf("%s\n", msg.c_str()); |
| } |
| |
| void SkStrike::onAboutToExitScope() { } |
| |
| #ifdef SK_DEBUG |
| void SkStrike::forceValidate() const { |
| size_t memoryUsed = sizeof(*this); |
| fGlyphMap.foreach ([&memoryUsed](const SkGlyph* glyphPtr) { |
| memoryUsed += sizeof(SkGlyph); |
| if (glyphPtr->fImage) { |
| memoryUsed += glyphPtr->computeImageSize(); |
| } |
| if (glyphPtr->setPathHasBeenCalled() && glyphPtr->path() != nullptr) { |
| memoryUsed += glyphPtr->path()->approximateBytesUsed(); |
| } |
| }); |
| SkASSERT(fMemoryUsed == memoryUsed); |
| } |
| |
| void SkStrike::validate() const { |
| #ifdef SK_DEBUG_GLYPH_CACHE |
| forceValidate(); |
| #endif |
| } |
| #endif // SK_DEBUG |
| |
| |
